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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b46e84c3edab71a3018e4f2905820f8dd0fb675c358551b7d66a94e4e9d46d' 
  AND token = 'qyLs9gu0DK1gj2ukKptc7pjkMX78dY9n+eP1pKbqZeI=' 
  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"
    }
  }
}