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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c3e5eea6831bd0bad9efd64f0a8660d9ed8360d77847dfd4693ed7c5373165' 
  AND token = 'P2wloQyzK+s4i3K4VgH0O8L6BFshxf74A2SqiFjKcv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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