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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421f75c20184d2ba211196192ced30c5e81e4dcb238f490b613b738441647ef7' 
  AND token = '8RGEAYhm2yFSw9DVQftkCXllmyTC+VbuQ6vS5p7NgOw=' 
  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"
    }
  }
}