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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568fc6e4052fae52a60c9e54ab1918bc457e78841f2006b17b32841a0a27f6c8' 
  AND token = 'QKyi+hFoAgvtXptigxji0FXnD+D/5fUBya2M4MP1Enk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}