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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a634d33b4798e2a41081f2a6194c8a1dd0cd36d450b57c8c6dd3768372436d33' 
  AND token = 'mKN18iToVZdtOmwe4jJUxI2Snrg+vFu3Hmsos0k4duc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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