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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523bf809ac3e58eaed39c70f438af06d1885becf91ab32213a8e0fb9b889e879' 
  AND token = 'X7sxRcZJL1iBOo8mdq336fdFxC+T4aW1FyaeCAW/3jw=' 
  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"
    }
  }
}