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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7ddee1aa7b040f7a9f9f2cd4ce47836d4a1a9bab0592aa5047a8199007902f' 
  AND token = 'i1+CsPAhXOrkH2NIIGtXNLIosoju2kQiCtVIAGV2TUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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