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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83cf5008354b5ade134b56321873b5a1d88a05f2a87042ec8320fe70f6c5cfd' 
  AND token = 'fcTlNYw0UnLhkS6lDk3pUfQSTXm03Ob8O439zbzK9rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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