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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb83ccd90322e7a771d3c99dd26ec995219df61737289c84c5257763bccdba6a' 
  AND token = '1vxE9l3HMeJljf9/E/PJzn0tTXz7jYc5R8UmbXf5gN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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