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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c915349400f9a454ca2d78f38775369bc1ec04e5fe4bea2ccde085a9aa85e7' 
  AND token = 'iwG24tod+WnZKW/f4pT0trklmziSKa+JkvxxZC5WwnU=' 
  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"
    }
  }
}