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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991a33ff530d8a4e0109a196caea6d94876c4eedd160f555d5b13a4e8458cfa7' 
  AND token = '8iLb5PZQgAc7pdvSo558NBNvVBdVSQEfkDIC5XRPZLQ=' 
  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"
    }
  }
}