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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f624fe124bbf757fd724989a2c40669a8ad6d8e80ad865c73850729c7108cd' 
  AND token = 'O51cWJ2W2LMlwC7oKXuW+LYFbRH5qq0pqv7i8Xr20JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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