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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdede662443c00244bc5869ec3af3c7ee2f20e48ee7788aa940341835f8a599' 
  AND token = '2vYZs7IY9hb9tRal45S0TV2MwY6UxPS6ofHLE2/XY3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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