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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06befbedc40c1d1659035658b2aefbdb4df4f4df3c3e599d3e5ab3225501bc41' 
  AND token = 'XDNEDzW64vbvYY2aGOJ9EdTS0Km10QaFCNgYWbM5DXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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