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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f9bd660f6de355ac1df64a9d1257adb452d23135188389f8cd1bd14ba22fb6' 
  AND token = 'DvuDVYwaEXFkf0jNGAleuZ8V/ZDd0fH97IHooGU+Q48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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