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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6467302db042723a525e49da377e72e6cdcd4114556aa105aa5e393673815c' 
  AND token = 'z43RotPISpyqndnxG+uMwFmr/F48iQCkfQr2Y/kFS5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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