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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818c71d9a351243e53de1c86791f35a33a4a5dc58bbe5de4ae15a408aa29e33a' 
  AND token = 'WILuUqzRW1DthB3FajUuIJRpnBMTh3r8DxoMUTblZVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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