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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df34579144a10f6e2a6d02ca095402c216fe3f759b69750a26fd646c85d86f8' 
  AND token = 'FeSUvKmRnax1suT1zMaj8tpFKT/xTZwc5bwKkO1SW0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00275

JSON explain

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