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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1dbb72127698f197a4ae30931fb3b511a0459a8aaa5106692629cde986f88d' 
  AND token = 'AY0qSv8+b90bfWUHKI9s01sRN9K3klvm1Q9Jeg3m/z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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