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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3932403a69cdb03138c8df97f19ae0b35608e1a1761955e646a56d962f64c81b' 
  AND token = 'XMnOLP02Cj6ATLs418tXk8eQXOKhZ0+9eppkV4S/vjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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