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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9b21824e60db5fcab87a5645021c1f87687d21c771b08579e7e80d4465d148' 
  AND token = '8P+6ENUx+KOOZGzhDF4SFJGTMJWtjYGmfZDDN1DKeaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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