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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71b4ab6542ed0059b606da5291467e6057bf60585e1402775540f4d52a51c52' 
  AND token = 'AWKUj5waT/A7bheZudghypOjoNeMu2YX9cOH3vse2XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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