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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ac13e5258825e907b5a6f06df0347eebb359c063c5f8fcc740c51378e99f10' 
  AND token = '0VXi5Od1+Quhp9xEYNN60gT4XC2KoVIQea4sGC0P3UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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