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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2522394230bf5c1c70e63065a701babb46477cc55b5d8e56d75d333e2f921f9e' 
  AND token = '1jAjmeZJ5Vbo7Fibal344ufM0D2j+c9F4ybwnPwv0YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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