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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a29f29922670f5c115bf922774d294f2076a1ac178664505c818863d8ded6c' 
  AND token = 'LqcxDhMtIOjfZ5v43ertUEuI9RdPOhEke0weU3vgAmE=' 
  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"
    }
  }
}