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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6414897df6057f9c509107f27ad9464dc53685e3d7d41a7c833329ec7f55a956' 
  AND token = '91ZKmfgLEeIQoh7E65+ISvhZTn01nKSawEybreGuTRw=' 
  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"
    }
  }
}