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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75e3ad9cbb699974456d86fedcc3049cdbe750dffb7b2475bee935d17330184' 
  AND token = 'D/gcSOMk59ZBQeQoIT9LJSwV+X/axl3toPzcYZaKs9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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