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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32a957241a365bbd0e31cdd4134239371298660235a4f61ddb34a27efc6a360' 
  AND token = 'l/D7Ze5KI9YIObrF0jhrBmt46b2ascCCa2uTvOKXu+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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