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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a18e119ef832e4195739dc42cd534186612e0590c7e6b48aacc825f048ed61' 
  AND token = 'vpz+l2oUec0IKiN1hQxihHnksRXPK/D1s5b4Dvu45f0=' 
  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"
    }
  }
}