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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80edd0a4f696efd17eb6a3533d14fbddd0fb268dd18b9483bd77f1a1018574b' 
  AND token = 'UWJB6aCcCSIjb5R6y3XdzbCs33JqKTXB5ScJpAud6Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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