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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdda4211d702d15be75a749ed16a5937dd7b3a0cf2d7a8765efc90ce252dc4a0' 
  AND token = '9h/gYrCPStbyxu9Z3WaWUedYM/n83wJU7/PCn4b27bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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