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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063bf24b4b1428ae6766d42d88b4e97a823656026f5104749b32363f11f96abb' 
  AND token = 'cAA7PGch/4W0L2yC1KSkFz72DTZnkZTi0jZmuYsMFRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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