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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3ceef90314f47ce9e64189463dbf61895091cd327433afac97951bb75e0c37' 
  AND token = '+3CmpBgKXUB9Wz/12lzayE9vGR5My7i8KSaGCKG/kjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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