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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c017520c662b3fe5f996bc29185e040f420cb39cd1d206f6cfeea6d1303002' 
  AND token = 'vHe/ll+rYznskLsGwkqcg3WSaaRBlMIOi1dQnE3nqtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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