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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af333a07af2011e01bee2df903135ea4ff5393dc37d38e7085bf655dfe6e3df' 
  AND token = '5nuYgArKOsjZ5jssY8WwzzEj98wdt1oesVp5KzvQpBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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