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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da6351dd1ce2311b385a0d9db77b27b750e154efb78bb6bfe76de02e13b5762' 
  AND token = 'uvzMzhtVEbBiO8AZBsZL4V5z6B7uu0kO206UOrYrmaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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