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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ee8f7300c3d3c9f8d9c6dcababb47e12b48d43d8ae70d3a05a47d3f083480e' 
  AND token = 'HxDcKIbc1TfYwLaooGU8LxfIJlgrhI1lpt4cIp/352Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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