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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f1c5bd206fbf18581a47130f0b45eba6755b7e1a2ae722d4020e3d43d60648' 
  AND token = 'CCXySrYN5sUlIjcR1PJ5fvqyxM8Q2xzydy8VvJaiPQI=' 
  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"
    }
  }
}