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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc29596ae8ecf7a4d8a8054ac063ecc2fcfc6bff6cd52d44421911e838c96e6' 
  AND token = 'REWDgmiFWZ6bu+bb/qOYFjIRe/HZhKO+ni+s77v12AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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