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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d862129239fd10fecc27b42a91ad2a047c5561e8bab03fa2c9993f89d114fc' 
  AND token = 'uYVbdfbVFL/CS0wokxWFDUaN9Pd7LV8/6EOvsLViuFE=' 
  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"
    }
  }
}