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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6c5fe020d55ff70311c151d45ac1bf99278eb149fe96b4c74dbaf587133e3e' 
  AND token = 'vv5edYZJsBut9emHRgSgAx9KtR/6LH9O76LVW9EQxY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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