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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c461e954eb8562ec118adc14f514eb4716fdc6235ff544876e0aa63790cd24' 
  AND token = 'cioMgpmB09S05SCKA83AYgrViBdQ/tiagOd+rpNiZaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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