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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de01c7619f5f4c1d4b9a21ce975f33f0cc312ed9a035a4cce78322e0f4351575' 
  AND token = 'yJPkFt1Zi/psB3MnedP50LeKnXp8DnpMMDEXt665/Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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