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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7620963844cc152df5cff41d125c3fc9485ea4eadee15d0ffe55a9eb9f18fd48' 
  AND token = '4ZwZ+Q7GTyl326CHwPA7dxny4PCAnaXphWvKGm6uyl0=' 
  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"
    }
  }
}