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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feaa59303c1280cc327839a726479200e50e166e1a71170b8d83c9ff867b1dea' 
  AND token = 'GXMpIXPnj8crzkRn1GBd5HS0ldmMQKP3Og8LEnxg59A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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