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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55687f72a77335c2826d2699342404977cc8b0ccb7024e172d1d6296ccbe63d' 
  AND token = '6sPLfd7Ek2GepompHA6URitgdiGHVeFamTqjW/RR05M=' 
  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"
    }
  }
}