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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133b57febacd339caf9b7c968e46e794567b76d5e7b0477be780829222fcc582' 
  AND token = 'eSu6lCiO90MbnUcvdDGirfY9fQI6mm+c8J43FKsqsN4=' 
  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"
    }
  }
}