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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1574950e9fd82b6f5cd054337d4329e0dd227493ed6b15247bc55a2afc08726' 
  AND token = 'rA2bFXI5zgwSX3Gg9/r1jFhOlRMcJPp/6yowRi7Gypg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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