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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8812533292a201bafb8e1d32091d9f0cd515440ca7fdce73f543fcb242a2b09a' 
  AND token = 'aH/39jum6Djf7IDk1ucL0EFx+E1oeluL76LXa7Qyb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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