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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4325018146645fcef37e23773280019c58fe17b34fdc7f0cd4e15b033aa04d' 
  AND token = '+m4Hw6fXMHGHh/4uyTa39fiK+a7HKBOIUNzRU/xD50w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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