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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4c7805d5f5d28b545b05a95da040595040c40c318c1d616adf26cbc9e9b107' 
  AND token = 'yyN+h6crOnmRiuqqJ/foQ4vShe6r0y8FWSZhwYh0Q9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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